5 Best Red Dots for FN 5.7

About the FN Five-Seven

The FN Five-seveN, a semi-automatic pistol from FN Herstal, has earned a reputation for precision and innovation over its two decades of service. Designed as a companion to the FN P90 personal defense weapon, the Five-seveN fires the NATO-standardized  5.7x28mm cartridge, known for its superior range, accuracy, and low recoil.

This lightweight, polymer-based pistol features ambidextrous controls, a chrome-lined cold hammer-forged barrel, and a smooth trigger for pinpoint accuracy. Initially exclusive to military and law enforcement, it has been available to civilians since 2004, gaining popularity for personal protection and target shooting.

With new models in FDE and black, available in 10- and 20-round capacities, the Five-seveN continues to serve over 40 nations, including elite U.S. law enforcement units like the Secret Service, maintaining its legacy as a groundbreaking and versatile firearm.

 

 

Best Red Dots for FN 5.7

1) HOLOSUN HS507C X2 Red Dot 

The Holosun HS507C X2 Red Dot Sight is the best red dot for FN 5.7. It features two reticle options (2 MOA Dot & 32 MOA Circle), unlimited eye relief, long battery life (50000 hrs),10 DL & 2 NV brightness settings, and Solar and Battery power sources, among other features.

It is a standout option for FN Five-seveN owners seeking a reliable, feature-packed optic. Designed as an open reflex sight for full-sized pistols, it offers cutting-edge technology and durability, making it a perfect pairing for the high-performance FN Five-seveN. The sight includes essential accessories like a T10 L key, a CR1632 battery, a lens cloth, and a user manual for a complete and convenient package.

The HS507C X2 boasts Holosun’s Red Super-LED technology, providing up to an astounding 50,000 hours of battery life. Paired with the Solar Failsafe feature, the sight ensures reliable performance even if the battery fails, utilizing ambient light to keep you in action. The reticle options include a versatile 2 MOA dot and a 32 MOA circle, making it adaptable for various shooting applications.

Holosun’s innovative Shake Awake Technology prolongs battery life by deactivating the LED when the sight is idle. A slight motion instantly reactivates the red dot, ensuring that your sight is always ready when needed. Customizable settings from 10 minutes to 12 hours allow for user-specific preferences, while the feature can also be disabled if desired.

Crafted from 7075 T6 aluminum with an anodized surface finish, the HS507C X2 is built to withstand tough conditions. The optic’s side-mounted battery tray makes battery replacements quick and hassle-free, while its industry-standard footprint ensures compatibility with various mounts and pistols.

The sight also features parallax-free optics, unlimited eye relief, and 10 daylight and 2 night-vision brightness settings for optimal performance in any lighting condition.

 

 

 

 

 

Pros

• Exceptional Battery Life: Up to 50,000 hours with Solar Failsafe backup.
• Versatile Reticle Options: 2 MOA dot and 32 MOA circle for varied shooting needs.
• Shake Awake Technology: Ensures the sight is ready instantly and conserves battery life.
• Durable Build: 7075 T6 aluminum housing with an anodized finish for rugged use.
• User-Friendly Features: Side-mounted battery tray for easy replacements and multiple brightness settings, including night vision compatibility.

Cons

• Learning Curve: New users may need time to familiarize themselves with the multi-reticle system and advanced settings.

 

2) Holosun HS407C X2 Red Dot

 

 

The Holosun HS407C X2 Red Dot Sight is an outstanding addition to the FN Five-seveN, delivering precision, reliability, and user-friendly features. Designed as an open reflex sight for full-sized pistols, this optic enhances target acquisition and accuracy with its expansive field of view and high-performance technologies. Its inclusion of a T10 L key, CR1632 battery, and user manual ensures a complete and ready-to-use package.

The HS407C X2 features a 2 MOA red dot reticle, offering pinpoint precision for shooters. Powered by Holosun’s Red Super LED, the sight boasts a remarkable 50,000-hour battery life, ensuring consistent performance in extended shooting sessions.

The Solar Failsafe feature provides a secondary power source, automatically adjusting reticle brightness to match ambient light conditions for optimal visibility.

The inclusion of Shake Awake Technology sets the HS407C X2 apart, conserving battery life by deactivating the LED during inactivity. A light motion reactivates the optic instantly, ensuring it is always ready for action. Customizable activation settings from 10 minutes to 12 hours provide flexibility for different shooting scenarios.

Built with 7075 T6 aluminum, the HS407C X2 is engineered to withstand demanding environments. Its anodized finish adds an extra layer of resilience, while the side-mounted battery tray simplifies replacements without removing the optic.

Featuring an industry-standard footprint, this sight is compatible with various mounts and platforms. The Lock Mode prevents unintentional adjustments, keeping your settings secure during use.

 

 

 

 

 

Pros

• Precise 2 MOA Dot: Ideal for accurate shooting and rapid target acquisition.
• Exceptional Battery Life: 50,000 hours of performance with Solar Failsafe backup.
• Shake Awake Technology: Extends battery life and ensures instant readiness.
• Durable Build: Constructed from rugged 7075 T6 aluminum with a protective anodized finish.
• User-Friendly Features: Side-mounted battery tray, Lock Mode, and parallax-free optics.

Cons

• No Multi-Reticle Options: Limited to a 2 MOA dot compared to other Holosun models with multi-reticle systems.

 

3) Trijicon RMR Type 2 Red Dot Sight

 

The Trijicon RMR Type 2 Red Dot Sight is one of the best red dots for FN 5.7, it is engineered with military, law enforcement, self-defense, and hunting in mind, combining cutting-edge durability with user-focused features. Whether in high-stress situations or casual target practice, the RMR Type 2 delivers exceptional reliability and performance.

The RMR Type 2’s patented housing design sets it apart, absorbing impacts and diverting stress away from the lens to ensure long-lasting performance.

Built from forged aluminum and waterproof up to 66 feet, this optic is crafted to endure the most challenging conditions, from harsh weather to rough handling. Its rugged electronics and battery contacts further enhance its reliability in demanding environments.

This red dot sight offers both manual and automatic illumination modes, giving users full control over brightness levels. The Adjustable LED feature allows easy toggling between modes via side buttons, and the optic automatically returns to automatic mode after 16.5 hours of inactivity.

Additionally, the sight is compatible with night vision devices, making it suitable for low-light applications. The 3.25 MOA dot is versatile, small enough for precise shots at a distance yet large enough for quick target acquisition.

Precision is further enhanced with the RMR Type 2’s true-color, multi-coated lens, which minimizes color distortion while optimizing light transmission.

Windage and elevation adjustments are effortless, requiring no special tools and offering 1 MOA per click for fine-tuning your aim. Compatible with multiple platforms, this optic can be seamlessly integrated with rifles, shotguns, and carbines, or used as a secondary sight alongside magnified optics.

 

 

 

 

Pros

• Superior Durability: Patented housing and forged aluminum construction resist impacts and harsh conditions.
• Versatile Illumination: Manual and automatic brightness settings with night vision compatibility.
• Long Battery Life: Over 4 years of continuous use on a single CR2032 battery.
• Precision Targeting: 3.25 MOA dot provides balance for long-range accuracy and quick targeting.
• Multi-Platform Compatibility: Usable across various firearm types.
• Waterproof Design: Withstands depths up to 66 feet for all-weather reliability.

Cons

• Price: Premium durability and features come at a higher cost.

 

4) Leupold DeltaPoint Pro Reflex Sight

 

The Leupold DeltaPoint Pro Reflex Sight stands as a testament to uncompromised performance in a compact design, making it a top choice for FN Five-seveN enthusiasts. Combining rugged durability with advanced optical performance, this red dot sight excels in tactical and hunting scenarios alike. Its professional-grade features and user-friendly design ensure it meets the demands of both professionals and recreational shooters.

The Leupold Professional-Grade Red Dot Optical System delivers exceptional light transmission, ensuring a clear, bright image even in challenging lighting conditions. Its industry-leading glare reduction maintains a crisp sight picture in direct sunlight, while its optical clarity and resolution are tailored to meet the expectations of professional guides and marksmen.

The 2.5 MOA dot reticle offers a fine balance between quick target acquisition and precision accuracy, and the illuminated reticle proves invaluable in low-light conditions.

Constructed with a lightweight aluminum housing shrouded in rugged spring steel, the DeltaPoint Pro is designed to withstand harsh environments. It is waterproof, shockproof, and fogproof, ensuring reliable performance in all weather conditions.

Additionally, Leupold’s legendary quality is evident in every detail, from the Diamond Coat lens coating for enhanced durability to its ability to endure extreme temperatures ranging from -20 to 120°F.

Designed for practicality, the DeltaPoint Pro features a tool-less, spring-actuated battery compartment on top, allowing quick battery changes without removing the sight from the firearm.

Its Motion Sensor Technology (MST) extends battery life by deactivating the illuminated reticle after five minutes of inactivity and instantly reactivating it upon movement. With click-adjustment precision and 1 MOA per adjustment, dialing in your zero is both intuitive and precise.

 

 

 

 

Pros

• Outstanding Optical Performance: Exceptional clarity, glare reduction, and low-light visibility.
• Rugged Design: Lightweight aluminum and steel construction that’s waterproof, fogproof, and shockproof.
• User-Friendly Features: Toolless battery replacement and easy click adjustments.
• Extended Battery Life: Motion Sensor Technology ensures efficient energy usage.
• Wide Field of View: Incredibly expansive viewing area for situational awareness.
• Versatile Reticle: The 2.5 MOA dot balances quick acquisition and accuracy.

Cons

• Battery Life: 300 hours is moderate compared to some competitors.

 

5) Sig Sauer Romeo Zero Reflex Sight

 

The Sig Sauer ROMEOZero Reflex Sight is a micro red dot designed for precision and rapid target acquisition, making it one of the Best Red Dots for FN 5.7. Optimized for everyday concealed carry and slim-slide pistols, this reflex sight blends advanced technology with rugged durability, ensuring reliable performance in both tactical and everyday scenarios.

The ROMEOZero’s ultra-compact and lightweight design is tailored for slim slide profiles, including polymer pistols and sub-compacts. With a 1x magnification and a 3 MOA red dot reticle, the sight delivers rapid target acquisition without sacrificing precision. Its stippled housing integrates seamlessly with compatible firearms, enhancing both aesthetics and functionality.

The SpectraCoat HD Polymer Lens offers 10 times the impact resistance of traditional glass lenses, making it ideal for rough environments. The WeaponsGrade textured polymer housing further reinforces its durability, ensuring protection against drops and harsh conditions. Despite its lightweight design at just 0.4 oz, the ROMEOZero delivers uncompromising ruggedness.

Equipped with MOTAC (Motion Activated Illumination System), the ROMEOZero conserves power by activating only when it senses motion and powering down during inactivity. This technology, combined with a highly efficient LED emitter, supports an impressive 10-year battery life, ensuring you’re never caught off guard. With 8 user-configurable brightness settings, the red dot performs exceptionally well in varied lighting conditions.

The ROMEOZero is compatible with Shield RMS-c and J-Point footprints, making it versatile for mounting options. Its parallax-free design ensures that the red dot stays true to your target, regardless of your viewing angle.

 

 

 

 

 

Pros

• Lightweight and Compact: Ideal for concealed carry and slim slide pistols.
• Exceptional Durability: Rugged polymer housing and impact-resistant lens.
• Efficient Illumination: MOTAC ensures power conservation and quick activation.
• Versatile Brightness: Eight illumination settings for various lighting conditions.
• Extended Battery Life: Industry-leading 10-year battery lifespan.
• Wide Compatibility: Supports multiple mounting footprints.

Cons

• Polymer Lens: This may not appeal to users preferring traditional glass optics.

 

Next Read: Best Red Dots for SIG P365

Factors to Consider when Choosing the Best Red Dots for FN 5.7

Here are the most important considerations:

Durability and Build Quality

When selecting a red dot sight for the FN Five-seveN, durability is paramount due to the pistol’s powerful 5.7x28mm cartridge. The sight must withstand recoil, drops, and harsh environmental conditions.

Look for materials like rugged aluminum or polymer housings reinforced with impact-resistant coatings. Features such as waterproofing, fogproofing, and shockproofing are essential for reliability in diverse scenarios, from tactical use to adverse weather.

Reticle Size and Design

The reticle size impacts target acquisition and accuracy. For the FN Five-seveN, a 2-6 MOA red dot is ideal. Smaller reticles (e.g., 2.5 MOA) are better for precision shooting, while larger ones (e.g., 6 MOA) aid rapid target acquisition in close-range engagements.

Consider whether the reticle offers brightness adjustability to adapt to various lighting conditions, from bright sunlight to low-light environments.

Lens Clarity and Optical Quality

Clear, distortion-free optics are crucial for maintaining accuracy and visibility. High-quality lenses with advanced coatings, like SpectraCoat or DiamondCoat, reduce glare, enhance light transmission, and resist scratches.

The lens clarity ensures that you can track targets seamlessly, even in challenging lighting conditions, which is vital for a pistol like the FN Five-seveN that excels in tactical applications.

Battery Life and Efficiency

Red dot sights rely on batteries to power their illuminated reticles. Long battery life is critical to avoid unexpected failures during operation. Features like Motion Activated Illumination (MOTAC) extend battery life by powering down when idle and activating when motion is detected. Models with CR2032 batteries often offer hundreds to thousands of hours of runtime, ensuring readiness when you need it most.

Size and Weight

Given the FN Five-seveN’s lightweight and ergonomic design, the red dot sight should be compact and low-profile to maintain balance and ease of handling. Micro reflex sights, weighing around 0.4–1 ounce, are excellent options as they complement the pistol’s slim slide and are less obtrusive during concealed carry or tactical use.

Mounting Compatibility

Not all red dots are compatible with every pistol. Ensure the sight supports the mounting footprints used by the FN Five-seveN, such as Shield RMS-c or J-Point footprints. Compatibility with direct mounts or adapter plates specific to the FN Five-seveN will simplify installation and guarantee a secure fit for reliable performance.

Brightness Settings and Adjustability

Versatile brightness settings allow the reticle to adapt to different lighting environments, from pitch-black rooms to bright outdoor conditions. Many high-quality red dots offer 8–12 adjustable brightness levels, including night vision compatibility. The ability to fine-tune brightness ensures visibility without overwhelming the user’s sight picture.

Price and Warranty

Red dot sights range from budget-friendly to premium options. While higher-end models often include advanced features, durability, and better optics, affordable models may still offer sufficient quality for casual users. Consider your budget and the warranty offered; reputable brands often provide lifetime warranties, ensuring long-term peace of mind. For a pistol like the FN Five-seveN, investing in a durable, reliable optic is a worthwhile decision.

Best Red Dots for FN 5.7 FAQs

1. Why is a red dot sight beneficial for the FN Five-seveN?

The FN Five-seveN is a precision pistol known for its flat-shooting 5.7x28mm cartridge, making it an excellent platform for adding a red dot sight. A red dot enhances target acquisition speed, improves accuracy, and allows shooters to maintain focus on the target while aiming. These benefits are particularly useful for tactical scenarios, self-defense, or competitive shooting, where quick and precise shots are critical.

2. What reticle size is best for the FN Five-seveN?

For the FN Five-seveN, a reticle size of 2–6 MOA is ideal. A smaller reticle (2–3 MOA) is better for precise shooting at longer ranges, while a larger reticle (4–6 MOA) aids in rapid target acquisition at closer distances. Choosing a reticle size depends on your intended use, whether it’s precision shooting, defense, or general-purpose applications.

3. Are all red dot sights compatible with the FN Five-seveN?

No, not all red dot sights are directly compatible with the FN Five-seveN. Compatibility depends on the mounting footprint of the sight and the pistol’s slide cut or adapter plate. Many FN Five-seveN models support Shield RMS-c or J-Point footprints. It’s essential to confirm that the chosen red dot sight matches the mounting options available for your specific pistol model.

4. How do I maintain and care for my red dot sight on the FN Five-seveN?

Proper maintenance ensures longevity and optimal performance. Clean the lens regularly using a microfiber cloth and lens cleaner to remove dirt or smudges. Check and replace the battery as needed, and use features like Motion Activated Illumination (if available) to extend battery life. Inspect the sight for any loose screws or mounting issues after use, and store the pistol and optic in a secure, dry environment to prevent damage or corrosion.

Final Thoughts

Choosing the best red dot sight for your FN Five-seveN can significantly enhance your shooting experience by improving accuracy, speed, and adaptability in various scenarios. With options like the Leupold DeltaPoint Pro, Sig Sauer ROMEOZero, and other top-tier sights, you can find a red dot that matches your needs in terms of durability, reticle clarity, battery life, and mounting compatibility.

Each of these sights offers unique features tailored for the FN Five-seveN, ensuring reliable performance in both tactical and everyday use.